Intelligence, birth order, and family size.

Personality & Social Psychology Bulletin
Satoshi Kanazawa

Abstract

The analysis of the National Child Development Study in the United Kingdom (n = 17,419) replicates some earlier findings and shows that genuine within-family data are not necessary to make the apparent birth-order effect on intelligence disappear. Birth order is not associated with intelligence in between-family data once the number of siblings is statistically controlled. The analyses support the admixture hypothesis, which avers that the apparent birth-order effect on intelligence is an artifact of family size, and cast doubt on the confluence and resource dilution models, both of which claim that birth order has a causal influence on children's cognitive development. The analyses suggest that birth order has no genuine causal effect on general intelligence.

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May 12, 2010·The American Psychologist·Satoshi Kanazawa

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Citations

Aug 16, 2015·The Lancet Global Health·Ossie Ferdinand Uzoigwe
Sep 15, 2015·Journal of Population Economics·V Joseph Hotz, Juan Pantano
May 31, 2013·Personality & Social Psychology Bulletin·Patrick R Cundiff
Aug 2, 2017·Psychological Reports·Ana Azevedo MartinsLeandro da Silva Almeida

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